Wikipedia:Reference desk/Archives/Mathematics/May 2009

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style="background: #5D7CBA; text-align: center; font-family:Arial; color:#FFFFFF;" | Welcome to the Wikipedia Mathematics Reference Desk Archives
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= May 1 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 1

1. Pairing colours, permutations and such
2. Complex integral
3. Exponential Addition

= May 2 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 2

1. Derivatives of functions of more than one variable
2. Binomial expansion
3. Essential singularity
4. calculating rate constant k

= May 3 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 3

1. How to make my own do it yourelf leading indicator?
2. What's going on here?
3. Adjusting a statistical snapshot for duration
4. Applications of Conway's cosmological theorem

= May 4 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 4

1. Application of Differentiation
2. Penney's Game
3. decimal to HEX

= May 5 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 5

1. Möbius strip
2. A couple probability questions about points on a sphere
3. Arclength of tan from pi eigths to pi fourths
4. Rational points on a circle

= May 6 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 6

1. Limits of differentiable functions
2. Cycloid
3. how to do monte carlo for statistics?
4. Non-discrete valuation ring
5. Group homomorphisms
6. for Buffon's needle does the length of the needle not matter

= May 7 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 7

1. Chaitin version of Gödel incompleteness theorem
2. bijection between RXR and R
3. why does having a unique right inverse for some function f imply bijectivity while having a unique left inverse doesn't?
4. List of functional analysis topics
5. statistics: is 98% confidence the same as 98% of cases out a billion?
6. 1 +1 ?
7. trigonometric functions
8. Arcs and Radii
9. Harmony in music based on periodic waveforms
10. Division of exponential random variables
11. Theorem guaranteeing minimum value of bounded function

= May 8 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 8

1. A derivative of the log of sigmoidal functions
2. Mathematics - Sequence analysis
3. trigonometric conversions
4. what does statistical confidence MEAN
5. what good are sins and cosins and all that stuff
6. someone above said 98% of cases out of a billion isn't 98% confidence -- why
7. Calculation problem including vector
8. factoring integers in polynomial time
9. Z-hat

= May 9 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 9

1. Gradient of linear graph
2. okay, is THIS confidence?
3. Logistic equation vs logistic map
4. MLS Matrix transformation

= May 10 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 10

1. Suggestion for a good book on axiomatic set theory
2. Numerical Methods for Solving PDEs
3. Means
4. Top mathematical journals
5. Simple vector equation: most general solution
6. Areas of circles
7. bicycling paradox

= May 11 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 11

1. Curvature question
2. do number of consecutive misses of coin toss follow normal distribution? What is the standard deviation?
3. Change of variables in 3 dimensions - please help!

= May 12 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 12

1. Countable axiom of choice--is it consistent with Axiom of Determinacy
2. Binary relations and equivalent conditions = Argh

= May 13 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 13

1. What are the benefits to humans of using a tree structure?
2. Second difference equation
3. Does mathematics exist in an empty universe?
4. Triangle areas
5. Finding an approximation to a linear system
6. 7 tens

= May 14 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 14

1. how many possible soduko variations are there
2. geometry and algebra
3. Limit of sequence
4. Rate of change
5. Totally real fields
6. Question from a mechanics past paper

= May 15 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 15

1. shape of solution space
2. logarithm
3. Fatou's Lemma and liminfs
4. Irrationality of Pi

= May 16 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 16

1. Correcting linear least squares coefficients for small samples
2. Showing an element is irreducible
3. Proof that n orthogonal vectors form a basis for $\backslash mathbb\{R\}^n$?

= May 17 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 17

1. does anyone know how to solve these?
2. Fairly simple $\backslash nabla$/inequality problem
3. LaTeX fraction spacing

= May 18 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 18

1. Decomposition of a symmetric matrix
2. how many spheres diam D1 can pack on the surface of a larger sphere diam D2
3. What is the ratio of the area of a circle to a square
4. 90 Degree Angle

= May 19 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 19

1. Lifting prime ideals to integral extensions
2. Name that theorem...
3. Exponential functions multi-valued?

= May 20 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 20

1. Goldbach conjecture
2. Parimutuel betting
3. transcendental equation
4. does anyone know how to solve this????

= May 21 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 21

1. concentric circles
2. Spheres in an n-dimensional sphere
3. joint probability distribution terminology

= May 22 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 22

1. HOW HE DID IT?
2. probability book?
3. Maximum Volume of Cone made from cut sector of a circle.
4. working out foot pound ratio for powder in grams

= May 23 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 23

1. A LaTeXnicality
2. Probability of dots on a circumferance

= May 24 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 24

1. Margin vs Markup
2. value of pi
3. Nonlinear Homogeneous Differential Equations
4. Plus-or-minus range

= May 25 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 25

1. New Elementary Suggestive Results Found By Birthday Coincidences Related To History
2. Proving inequality
3. perfect squares
4. conformal bijective map
5. Finding cube root

= May 26 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 26

1. Statistical fallacies in White Nationalist propaganda?
2. Nicer proof of Stirling's approximation
3. Bijection between R and C
4. Novel Problem Related To Research
5. Published puzzle
6. Diffeology
7. Implicit differentiation problem

= May 27 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 27

1. Chess openings
2. Notation for derivatives ?
3. Convergence of the series z^(n!)

= May 28 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 28

1. Wolfram Alpha exponentiation quirk?
2. Solving for a matrix...

= May 29 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 29

1. How many different types of six sided dice are there?
2. Analytical Continuation

= May 30 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 30

1. Eulerian city?

= May 31 =

Wikipedia:Reference_desk/Archives/Mathematics/2009 May 31

1. Lottery question
2. Parentheses and functions
3. Mathematical Drawing